MuscleNerd, member of the Dev-Team, clarified via Twitter that jailbreaking tools will be available right after official iPhone 3.0 release and that we have to wait until Friday only for ultrasn0w (new universal iPhone unlocking tool)
Right after 3.0 release make sure to monitor Dev-Team Blog for torrent links to "official" jailbreaking tools.
Stay tuned for our full iPhone 3.0 jailbreaking guide.
while you wait try this: How To Activate Internet Tethering Now On iPhone OS 3.0
Update: How To Jailbreak iPhone OS 3.0 Using Pwnage Tool 3.0
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